Spam users from foreign countries have conquered our measures to discourage their automated robotic registrations. We have employed rotating countermeasures, but obviously they intend to get past those. Once registered, they try to use email or PM to other registered users to advertise whatver product they market. The latest violators use a newly created email domain and then sequential individual users within that domain to get past our requirement to have unique email addresses to register. something like
Kyoto.com, and then it's 1@kyoto.com...2@kyoto.com....3@kyoto.com...etc

This makes it easy to spot and remove, but you may get advertisements from them in between the times we do searches, which are now daily.

We'll be trying new tactics to discourage them, but some still getting through. Please report any recurring ones to us